Earlier this month I posted about the use of tracking tunnels to monitor UK hedgehog populations. I also posted about introduced European hedgehog populations abroad. This article, published in the New Zealand Journal of Ecology, shows the success of tracking tunnels for detecting introduced hedgehog populations in New Zealand. Link to the full article here:

http://nzes-nzje.grdev.co.nz/new_issues/NZJEcol38_1_86.pdf

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Techniques varied in their ability to detect eight species of mammalian predator. The most efficient detection techniques included large tracking tunnels and hair tubes for feral cats (Felis catus), large tracking tunnels for European hedgehogs (Erinaceus europaeus), and WaxTags (R) for brushtail possums (Trichosurus vulpecula). Using our data to simulate a reduction in survey effort, we found that detection rates would be significantly reduced only when devices were at very low densities.